1. Al-Hussaini, M.M. and Townsend, F.C., 1973. Tensile testing of soils: a literature review. U.S. Army Eng. Waterways Exp. Station, Misc. Pap. S-7324, 96 pp.
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3. Pore structure and mechanical strength of soils in relation to their constitution;Aylmore,1978
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5. Theory of Land Locomotion;Bekker,1956